Three-Dimensional Triptycene-Based Covalent Organic Frameworks with ceq or acs Topology
Hui Li1, Fengqian Chen1, Xinyu Guan1
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, P. R. China.
Journal of the American Chemical Society
|February 10, 2021
Summary
Researchers developed new 3D covalent organic frameworks (COFs) using triptycene building blocks. These porous materials exhibit high gas adsorption capacities, particularly for hydrogen, advancing energy storage and environmental applications.
Area of Science:
- Materials Science
- Chemistry
Background:
- Synthesizing three-dimensional covalent organic frameworks (3D COFs) with novel topologies is challenging due to limited high-connectivity building units.
- Triptycene-based structures offer potential for creating complex 3D COFs.
Purpose of the Study:
- To design and synthesize novel 3D triptycene-based COFs with specific topologies.
- To evaluate the gas adsorption properties of the synthesized COFs for energy storage and environmental applications.
Main Methods:
- Symmetry-guided design principle was employed.
- Triangular prism (6-connected) nodes were combined with triangular (3-connected) or triangular prism nodes.
- Synthesis of triptycene-based COFs (JUC-568 and JUC-569) was performed.
Main Results:
- Two new non-interpenetrated 3D COFs, JUC-568 (ceq topology) and JUC-569 (acs topology), were successfully synthesized.
- Both materials demonstrated permanent porosity.
- Exceptional gas adsorption capacities were observed: CO2 (∼98 cm³/g), CH4 (∼48 cm³/g), and H2 (up to 274 cm³/g or 2.45 wt %), with hydrogen uptake being the highest reported for porous organic materials.
Conclusions:
- The study presents a viable strategy for creating diverse 3D COFs using complex building blocks.
- The synthesized triptycene-based COFs show significant potential for applications in gas storage, particularly hydrogen, and environmental remediation.
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